A euglena is a type of unicellular organism that can carry

What is the role of topoisomerases in eukaryotic DNA replication a Topoisomerise enzymes cut uncoil and reseal the double stranded DNA b Topoisomerise enzymes bind to the origin of replication sites within double stranded DNA c Topoisomerise enzymes join the Okazaki fragments together with phosphodietster bonds d Topoisomerise enzymes open up the double stranded DNA at the replication fork

First among asexually reproducing species what main mechanism produces genetic changes from one generation to the next and how does this mechanism do so Next describe in detail three main mechanisms that produce genetic diversity among sexually reproducing species placing emphasis on how two mechanisms in meiosis do so Lastly most eukaryotic organisms reproduce sexually What is a survival benefit s of this mode of reproduction

Table 1 TRIAL 1 Results Phenotype of worms worms eaten start worms left in grass worms after reproduction Forest 10 1 9 18 Turquoise 10 9 1 2 Kelly 10 0 ID Olive E 110 2 8 20 16

With COPD there is a decreased air flow from the lungs This could be caused by which of the following reasons Select all that apply Check All That Apply inflammation of major and small airways destruction of the walls between your lungs air sacs weakening of the respiratory muscles excessive mucus production

AOTD How do tree hole frogs adjust their calls within tree holes By adjusting the pitch of their calls By changing their physical appearance By changing their body temperature By increasing their vocal sac size

Listen Select all of the following types of fish that were abundant diverse in the Devonian period acanthodians tetrapods bony fishes chondrichthyans

Essay The second figure shows a Mesozoic Tetrapod Didelphodon The third shows a partial jaw of Didelphodon Pretend that you found these Wow an entire skeleton congratulations That s an extremely rare find Individual teeth and bits of bone are more common In your essay address the following topics Also find images that support the main evolutionary novelties that you discuss and paste them into your discussion You can use this list as an outline Enlarge the images as necessary to see details Locomotion What are three important novelties related to locomotion that you can clearly see in Didelphodon relative to Ichthyostega How do they differ from the anatomy of Ichthyostega How do they improve locomotion exactly Food processing What is one novelty related to food processing that you can clearly see in Didelphodon relative to Ichthyostega How does it improve food processing and energy management Phylogeny Draw a phylogeny that inlcudes these two organisms Label it with the major groups that these creatures belong to and where the novelties you discussed above originated There should be other branches besides just two for these organisms since Didelphodon is nested much higher in the Tetrapod tree than Ichthyostega Behavior Bevaior itself can t fossilize easily But you can make a guess about how Didelphodon may have behaved based on anatomy Clearly referencing the features you discussed above as evidence hypothesize a little about the behavior of Didelphodon

Match the following animals to the appropriate Crustacean class mussel shrimp barnacles 1 Branchiopoda tadpole shrimp 2 Maxillopoda 3 Ostracoda

Population size a Density dependence Growth rate slows at high density B A Time C In the figure above which letter indicates areas where r max is possible Arrow A Arrow C Arrow B None of the letters shown here

Percentage of females with mature follicles 100 Female paired 80 60 40 20 0 with male Female with group of males Female with group of castrated males All female group Female alone Females in natural winter habitat 0 1 2 3 4 5 6 Weeks In the above figure which of the following conclusions is most logical based on the data Females produce eggs faster when exposed to many males than do females paired with a male It is too complex to infer any logical conclusion After four weeks together females with males produce mature follicles to the ortant or females without males