Neutral mutations tend to accumulate in DNA at a predictable rate; like the ticks of a(n) __________, they can help researchers estimate how long ago two lineages diverged.

Fill in the blank(s) with the appropriate word(s).


molecular clock

Biology & Microbiology

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In flowering plants an ovary is part of a(n) ____

calyx

a. corolla b. ovule c. calyx d. stamen e. carpel

Biology & Microbiology

Where do axons of olfactory receptors synapse with interneurons?

a. olfactory bulb b. ganglia c. spinal cord d. nasal cavity e. peripheral nerve

Biology & Microbiology

In contrast to a eukaryotic chromosome, a prokaryotic chromosome

(a) is shorter and fatter (b) has a single loop of DNA (c) never replicates (d) contains many histones (e) all of these are correct

Biology & Microbiology

?-lactamase production is an example of which of the following types of resistance?

A) alteration of the target of the drug B) inactivation of the drug C) change in the permeability of the drug D) overproduction of an enzyme in a key metabolic pathway E) removal of the drug via a pump

Biology & Microbiology