A conjugation pilus allows bacteria to
A) attach to surfaces, aiding in the formation of biofilms.
B) move using an "oarlike" motion.
C) transfer genetic material.
D) infect their host.
Ans: C) transfer genetic material.
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The centromere
A. is a region of DNA where sister chromatids associate. B. is a group of proteins that attach to the kinetochore. C. is only present when chromosomes are highly compacted. D. is a group of proteins that attach to the mitotic spindle. E. is not present on the chromosomes of the daughter cells until the S phase.
If a pigment absorbed violet, yellow, orange, red, and green light, what color would it appear to be?
a. white b. brown c. black d. blue e. gray
Aphids pierce the tissues of plants with their tubular mouthparts and suck out the phloem juices
Because this food is mostly sugar water with a low concentration of protein, the aphids have to process large volumes of it to obtain sufficient protein. Most of the excess sugar and water passes right through the aphids' digestive tracts and is defecated as "honeydew," which is actively sought out and eaten by some ants. The ants will even "milk" honeydew by stroking the aphids. In return, ants protect their aphids from predators, even going so far as taking them inside overnight. The relationship between the aphids and ants is called A) predation. B) parasitism. C) competition. D) mutualism.
Assuming that an amino acid sequence is 250 amino acids long, how many different molecules, each with a unique sequence, could be formed?
What will be an ideal response?