Most animal hormones _____

A) are produced by endocrine glands
B) are lipid-soluble molecules
C) are carried to target cells in the blood or hemolymph
D) are protein molecules
E) elicit the same biological response from all of their target cells


Answer: C

Biology & Microbiology

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Some bacteria have a higher incidence rate of thymine dimer mutations following exposure to UV light than others. What might be going on here to lead to this outcome?

A. They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed. B. They may have a stronger expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained. C. They may have a weaker expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained. D. They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed AND they may have a stronger expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained. E. They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed AND they may have a weaker expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained.

Biology & Microbiology

Gonorrhea is a disease that may be

A. zoonotic. B. pandemic. C. syndemic. D. asymptomatic.

Biology & Microbiology

Positive feedback systems restore homeostasis. Indicate whether the statement is true or false

Biology & Microbiology

Which of the following virulence factors is specifically involved in helping an organism to physically spread throughout the body?

A) hyaluronidase B) endotoxins C) hemolysin D) siderophores

Biology & Microbiology