Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient
A) energy... down
B) transport proteins... down
C) energy and transport proteins... against
D) transport proteins... against
B
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What is the free-running nature of circadian rhythm analogous to?
a. a desktop computer b. a digital telephone c. an old-fashioned wrist watch d. a modern calculator
What event marks the end of zygotene?
a) the beginning of genetic recombination b) the end of synapsis c) the start of metaphase d) the formation of the synaptonemal complex e) the beginning of synapsis
Which of the following is not an example of a detritivore?
A. arthropods B. worms C. fungi D. vultures
A child falls and cuts her leg. The cut is deep enough that she is bleeding. Which of the following defense mechanisms will participate in eliminating microbes from the wound?
a. ciliary escalator b. inflammation c. normal microbiota d. lysozyme