__________, the first group of vertebrates able to complete their life cycle on dry land, have water conserving skin

and kidneys, and amniote eggs. Fill in the blank(s) with the appropriate word(s).


ANSWER: Reptiles

Biology & Microbiology

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Which type of selection is occurring with the ?-globin gene?

The human ?-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent the HS allele is maintained in the population. A. stabilizing B. directional C. disruptive D. balanced E. negative

Biology & Microbiology

Catabolism

What will be an ideal response?

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What happens to neurons in the approach known as optogenetics?

A) Mutations to ion channel proteins are corrected. B) The neurons are made to express light-sensitive ion channels. C) Neurotransmitter stores are depleted. D) Fusion of neurotransmitter vesicles to the presynaptic membrane is blocked. E) Leakage of cytoplasmic polyanions is blocked.

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Which organelle processes, modifies, and sends proteins to their correct destination?

a) Lysosome b) Smooth endoplasmic reticulum c) Golgi complex d) Mitochondria

Biology & Microbiology