________ is a technique used to measure ion currents passing through individual channels along a nerve cell.
Fill in the blank(s) with the appropriate word(s).
Patch clamping
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One reason food is refrigerated to control microbial growth is because irreversible cell damage is more likely to occur at low rather than high temperatures
Indicate whether the statement is true or false.
Double fertilization occurs when
A. the sperm and tube nuclei fertilize the egg. B. two sperm cells fertilize the two polar nuclei. C. one sperm fuses with the egg and the other sperm fuses with both polar nuclei. D. the polar nuclei fuse with the egg after it has fused with the sperm.
If the wild type DNA sequence reads THE CAT ATE THE BIG RAT, what type of mutation would change the sequence to THE CAT ATA ETH EBI GRA T?
A. Missense B. Deletion C. Insertion D. Nonsense E. Silent
Males of the fly species Drosophila bifurca are only a few millimeters in length, yet they hold the world record for sperm length, with sperm being 50mm long
Males produce only ca. 100 sperm over the course of their lives, as such large sperm are very costly to produce. One hypothesis to explain such large sperm size is postcop-ulatory sperm competition. Which of the following are reasonable approaches to test this hypothesis? a. test whether the order in which multiple males mated with the same female correlates to the number of offspring sired by each male b. examine the physical location of male sperm in the female reproductive or-gans via microscopy c. document fertilization success in crosses between a single male and a single female d. test whether the degree of sperm competition in related Drosophila species correlates with sperm size e. A, B, and D