What changes should result from using stem cells in therapeutic cloning?
A) healthy tissues
B) new genomes
C) model organisms
D) reproductive clones
A
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In meiosis, the number of chromosomes ______ while in mitosis, it ______.
(a) is halved/is doubled (b) is halved/remains the same (c) is doubled/is halved (d) remains the same/is halved
Lysosomes function best at a pH of ____
a. 7.4 b. 6.5 c. 3.2 d. 5.0 e. 8.2
The growth rate of a population per unit of time is calculated by using this formula: G = r x N. What is the quantity r and how is it calculated?
a. The quantity r is the exponential growth rate and is calculated by subtracting the number of deaths from the number of births. b. The quantity r is the per capita growth rate and is calculated by multiplying the number of births and the number of deaths. c. The quantity r is the per capita growth rate and is calculated by subtracting the number of deaths from the number of births. d. The quantity r is the biotic potential of a population and is calculated by adding the birth rate and the death rate. e. The quantity r is the monthly net increase of a population and is calculated by subtracting the number of births from the starting population size.
How do companion cells load most of the carbohydrates into sieve tube members?
a. by symport b. through carrier proteins c. through plasmodesmata d. by antiport