Biology Questions

What is the average radius of a piece of double stranded DNA in water that has a link length of 5 8 nm and and is 2237945 links long Submit Answer Tries 0 99 of the two strands of the double stranded DNA are separated each chain now has a radius of 1163 nm What is the link length for single stranded DNA Submit Answer Tries 0 99

Source Pinterest com What is the name of a gram positive coccus that does not utilize glucose and does not reduce nitrate What is the name of a gram negative rod that utilizes lactose and citrate and produces indole What tests would you do if you suspect you have Proteus mirabilis What does Methyl Red test separate Question 3 Choose Gram negative rods that utilize lactose do not produce indole and produce urea Gram negative rods that utilize lactose but do not produce indole Gram stain glucose and lactose utilization indole and H2S production C intermedius None of these M bovis Gram stain glucose and lactose utilization indole production and urea hydrolysis E coli Choose 1 pts

Below is a generalized cast of Australopithecus afarensis cranium as there are many specimens Mark all that apply below My What large molars you have but not as large as Paranthropus below O My What a large brow ridge you have My What an orthagnathic faco com

Here is our probable hominin Ardipithecus ramidus cranium from Ethiopia The cranium itself it not particularly large maybe about 6 7 inches front to back Ardipithecus ramidus 2501 1rp96 1 cranium by RLA Archaeology on Sketchfab The foramen magnum is only partially present on this specimen areas in grey are reconstruction whereas textured brown represents actual fossil The cranium of Ardi doesn t really illustrate all the mosaic evolution in the post crania bones from the neck down The canines are thought to be less sexually dimorphic than that of chimpanzees which is one of the reasons some researchers think it may be on our lineage

A hominin is an ancient ape hominoid that we believe to be specifically on our lineage and not another ape s lineage our ancestor and ours alone What traits do we typically look for in fossils to indicate that they might be a human ancestor mark all that apply evidence of bipedalism associated with closed or wooded habitats evidence of reduced sexual dimorphism compared to other apes usually in the canines more central foramen magnum

Life History Theory posits that the timing and duration of the stages and phases of life are ADAPTATIONS and thus shaped by Mark all that apply O evolution chimpanzees genetic drift gene flow culture natural selection

The earliest apes hominoids appear in Africa in the early Miocene By the middle and late Miocene some have mark all that apply Omigrated into Europe Omigrated into Asia developed more modern ape like body plans with longer arms and grasping hands

The Obstetric Dilemma and the EGG Hypothesis both seek to explain O food sharing in communities O endurance or long distance running O the maternal constraints on the duration of human gestation or why mom can only be pregnant for so long O long childhood

What two gases are exchanged between the respiratory system and t circulatory system O carbon dioxide and hydrogen Ooxygen and carbon dioxide Ohydrogen and nitrogen

According to this information some organs of the gastrointestinal tra Food is digested in the gastrointestinal tract to provide nutrients to the body In addition various hormones secreted from the lining of a few digestive organs allow other organs to function properly fit in more than one organ system Operform only one function at a time Osupply the body with platelets produce soluble vitamins

5 Mendel s Laws 5 3 Define Mendel s two laws How do we use probability rules to predict the results of genetic crosses 6 Pedigrees 5 3 Diagram simple pedigrees for a dominant trait a recessive trait and a sex linked recessive trait Label with appropriate genotypes 7 Punnett Squares 5 3 Draw Punnett squares for a monohybrid cross a sex linked cross and a dihybrid cross Give the expected phenotype and genotype ratios for each 8 Non Mendelian Genetics 5 4 Not all traits follow Mendelian patterns Explain how this statement applies to a degrees of dominance b multi gene traits c mitochondria and chloroplasts 9 Environmental Effects 5 5 Give an example of how the environment can influence phenotype Define plasticity Pg 56 10 Genetic Disorders 5 6 Make a chart of 3 human genetic disorders their symptoms and their causes Pg 11 Chi Square Analysis Science Practice 5 Statistical Tests and Data Analysis Show an example of a chi square analysis and answer the following questions How is a chi square test carried out What do its results tell you When do you accept the null hypothesis When do you reject it What types of data are suitable for chi square analysis Total 2 5 5 5 5 2 5 5 5 5

ons must be lost or gained by each of the following atoms to attain a noble gas electron configuration Be sure to indicate whether they are lost or gained a Ca d P b Al e Na c S f Cl What charge would each element obtain when it becomes an ion a aluminum e lodine b lithium f phosphorus c barium g sulfur d bromine h magnesium

1 What are valence electrons Why are they so important in chemistry 2 Write the electron dot structures for the following elements a Cl b S c Al d K 3 What is the octet rule e Ca f Ge

oths have even appeared to orbit around them the streetiamps come on a lang row of them glowing uselessly along the ring of garden chat circles the city center where your steps count down the sailing of delight end stop At your feet a bee crawis in smail circles like a toy unwinding end stof simile Summer specializes in time slows it down almost to dream And the noisy day goes so quiet you can hear the bedraggled man who visits each trash receptacle fersonification mutter in disbelief Everything in the world is being thrown away end stop Summer lingers but it s about ending It s about how things redden and ripen and burst and come down It s when lend Stop city workers cut down trees demolishing one limb at a time spilling the crumbs end stop of twigs and leaves all over the tablecloth of street

3 What is the role of the embedded proteins and how do they complete their job Hint they have 6 jobs at least 4 Identify what is the Fluid Mosaic Model of cell membranes and describe how it functions Use steroids cholesterol and glycoproteins in your response 5 Skill practice Which model best represents the structure of a plasma membrane in a nonaqueous environment with a cytosol environment similar to living cells

One of the following statements is true about oxidation of alcohols O A primary alcohol is always converted to aldehydes O A primary alcohol is always converted to carboxylic acids OA secondary alcohol is always converted to aldehydes A secondary alcohol is always converted to ketones All of the above

7 Describe the boundaries or barriers cell walls create 8 How are cell walls created what does their structure consist of

Source www britannica com O Abnormal condition of red blood cells Presence of bacteria in the blood O Destruction of red blood cells

What is the amount of toxin required to kill half the amount of the infected animals Response Percent 100 50 0 22 5 mg kg Source www chemsafetypro com B 20 mg kg 50 22 5 NOAEL 50 mg kg 15 DNEL LOAEL 10 15 20 25 Dose mg kg LD50 30 35

The following is a Case Report on Meningococcal meningitis B Hong Kong Journal of Emergency Medicine A 21 year old man presented to our A E Department with fever for one day On arrival the patient s BP was 109 50 pulse rate was 115 and oral temperature was 38 1 C He was fully conscious and clinically stable The patient also complained of headache vomiting for three times and severe dizziness No rash was noted by him He was a construction site worker and he had traveled to China a few days before his illness Which of the choices lists the signs of the infection Mark all that apply Severe dizziness BP 109 50 Headache Pulse rate 115

Observe the following diagram Which of the following pathogenic agents falls under this category 2 Broad spectrum antibiotics kill nonresistant cells 1 Normal microbiota keeps opportunistic pathogens in check pathogen ww www 100 www O XX Source OpenStax Microbiology XXX XXX Xw XX O Indigenous gut microbiota O Methicillin resistant Staphylococcus aureus O Ebola virus 3 Drug resistant pathogens proliferate and can cause a superinfection

Case study Patient X who is immunocompromised shows symptoms of myocarditis chest pain shortness of breath headaches fever fatigue swollen feet If the doctor suspects a bacterial infection what is the patient more likely to receive O Anthelminthic drug O Bactericidal drug Bacteriostatic drug O Antifungal drug

The following chemical disinfectants can be used as food preservatives Mark all that apply Formaldehyde and ethylene oxide Acids sorbic benzoic propionic sulfure dioxide nitrites Nisin Natamycin Quaternary ammonium salts

ERY PEN OXA TECO OXA wat dit VAN ESPANNE SPT VAN Source KBTyoutube Phenol coefficients M PEN 31 ERY TEC VAN OXA O Microbial contamination in a disinfectant solution O Microbial growth on selective media O Antimicrobial susceptibility SPT VAN OO O PEN OXA ERY TECO OXA wat S VA

On the topic of microbial growth control match the terms in the two columns BSL 4 BSL 1 Antiseptics Disinfectants Choose Choose Dangerous microbes posing aerosol transmitted infections Process of applying an antiseptic Microbes are not known to cause disease in healthy hosts Microbial chemical inactivation on the surface of skin or tissue Microbial inactivation on the surface of a fomite by chemical heat

A Construct explan Explain what is meant by turning on and turning off genes within a cell during cell differentiation 1 DREVEA 2 Describe the process of one type of cell signaling in embryonic development nospraul 3 An individual who inherits two of the same allele either BOTH a 900 2916m31 bns aslem nsswiad babivib vinavanu 915 15 s for a particular characteristic has a c Atrob b demonstrates lerne genotype gions to histASAS recessive homozygous dominant B Answer the following questions Jons What is the relationship between phenotype and genotype mucous alleles og m SEP TORE ming or BOTH

Question Which of the following is true of enzymes Next Enzymes increase the rate of chemical reactions by lowering the activation energy Enzymes can only be used once in any given reaction Enzyme function increases if the 3D structure is altered Enzyme function is independent of environmental conditions such as pH temperature etc

Fragile X is a triplet repeat disease True O False

Translocation is the process where the t RNA in the A site moves into the P site O True O False

During DNA synthesis the enzyme that continuously synthesizes the DNA is Primase O DNA Polymerase 1 ODNA Polymerase 3 DNALigase

Provide the abbreviation of the following nucleotide 01 07 OH OH MP NH d AG C TU DR TR NH

Instructions Watch the video The Crisis of Credit Visualized from this link https www youtube com watch v bx LWm6 6tA and explain what caused the 2007 8 Great Financial Crisis Also read the article The Global Financial Crisis in the AS AD Model and explain the following recession and the recovery with the AS AD Model Feel free to draw an AD AS Graph

https www youtube com watch v bx LWm6 6tA and explain what caused the 2007 8 Great Financial Crisis Also read the article The Global Financial Crisis in the AS AD Model and explain the following recession and the recovery with the AS AD Model Feel free to draw an AD AS Graph

at is the MIC shown by this Etest for antibiotic susceptibility E VA 256 192 128 96 64 48 16 12

When the antibiotic against a preexisting infection kills normal microbiota yielding proliferation of antibiotic resistant new pathogens When the normal microbiota keeps new pathogens under control When the antibiotic resistant pathogens inhibit the growth of normal microbiota causing new a new disease Question 13 0 5 pts What are the names of some chemicals that target bacterial DNA synthesis Mark all that apply Penicillin

What is the D Value or DRT in this Microbial Death Curve log10 of number of live bacterial cells 99876 HO 10 1 0 Microbial Death Curve 0 5 10 15 20 25 30 35 40 45 50 Time min Arithmetic scale O Log 10 D value Source OpenStax Microbiology half an hour 50 minutes Arithmetic number of live bacterial cells 10 000 000 000 1 000 000 000 100 000 000 10 000 000 1 000 000 100 000 10 000 1 000 100 10 1 Logarithmic scale O 10 raised to the power of 6 bacterial cells Time min 0 5 10 15 20 25 30 35 40 45 50 Number of cells 1010 109 108 107 106 105 104 103 10 10 10

It inhibits cell wall synthesis OIt creates thymine dimers O It reduces the pH of the cytoplasm O It causes oxidation of nucleic acids Question 7 0 5 pt What are the names of two natural chemical agents to control bacterial growth in meat O Natamycin

Source BiologyLibreText B Pathogenicity values O Antibiotic diffusion rates Turbidity of bacterial lawns

Bacterial cultures and medical devices that are transported need to be frozen choose the correct temperature from the list O 70 degrees Celsius or lower O0 degrees Celsius O 7 degrees Celsius O 2 degrees Celsius Question 5 0 5 pts Mycobacterium tuberculosis and Salmonella spp are killed by pasteurization

What is the difference between sonication and lyophilization Choose all that apply Sonication uses ultrasonic waves to cause cell cavitation Lyophilization inhibits bacterial metabolism by rapid freezing under vacuum Sonication uses salty water to inhibit bacterial metabolism Lyophilization uses high efficiency particulate air filter to remove microbes from a cleanroom environment

Connect the two columns Fungistatic Bactericide Viricide Bacteriostatic Question 3 Choose Choose Inhibits fungal growth Inhibits growth of all living microbes Kills all living microbes Inhibits bacterial growth Kills bacteria Inactivates viruses 0 5 pts

Helminths can evade the host s immune system by doing which of the following O Their larger size prevent the immune system to work properly Worms have a tougher cuticle O A protective cloak allows immune system evasion by glycan mimicry O All are correct

Which of the following terms is correct for COVID 19 Epidemic disease Pandemic disease Endemic disease Notifiable disease

The following is a picture of a black legged tick The bacterium Borrelia burgdorferi can be transmitted to humans through the arachnid s bite and cause Lyme disease What type of disease transmission is caused by this arthropod

View Available Hint s U G C A 3 5 DNA coding information strand G1 U DNA template strand G1 G1 Synthesis of mRNA G2 G2 T Transcription bubble G2 G2 G G2 RNA polymerase ACT G2 G2 G1 G2 Termination site Reset Help

Can you make two question about neurons and cell signaling and answer it in ur own wrd un 2 paragraph T

Can you make two question about neurons and cell signaling and answer it in ur own wrd un 2 paragraph I

First step of transcription RNA polymerase identifies the termination sequence mRNA strand and RNA polymerase are released The correct ranking cannot be determined Submit Previous Answers RNA polymerase identifies the start sequence DNA double helix unwinds to expose the nucleotide bases Last step of transcription RNA polymerase adds bases that are complementary to the DNA template Incorrect Try Again 2 attempts remaining The mRNA is the end product of transcription To synthesize the mRNA strand the DNA should unwind to expose the nucleotides and then the enzyme RNA polymerase recognizes and connects with the control segment in DNA to be tr The mRNA is assembled as the RNA polymerase moves down the DNA template adding complementary nucleotides to the growing RNA strand Transcription ends when the RNA polymerase reaches a termination sequence and the ne

Which of the following statements are correct with respect to protein synthesis Check all that apply View Available Hint s Protein synthesis always starts with an initiation codon The protein chain always stops with valine Uracil is one of the bases present in a DNA strand Many amino acids can be synthesized using one of two different codons If the codon AUG does not appear at the 5 end of mRNA it codes for the amino acid methionine A stop codon is not required to stop protein synthesis Submit Previous Answers X Incorrect Try Again One attempt remaining

Arrange the steps of transcription of DNA to synthesize mRNA Rank the steps of transcription View Available Hint s of DNA to synthesize mRNA To rank items as equivalent overlap them RNA polymerase identifies the start sequence First step of transcription DNA double helix unwinds to expose the nucleotide bases mRNA strand and RNA polymerase are released RNA polymerase identifies the termination sequence RNA polymerase adds bases that are complementary to the DNA template Reset He Last step of transcription