14C is heavier than 12C because it has ______
a. two more electrons than 12C
b. two more neutrons than 12C
c. two more protons than 12C
d. one more proton and one more electron than 12C
e. one more proton and one more neutron than 12C
B
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The biggest limitation of traditional light microscopy and electron microscopy methods is that they are unable to reveal
A) absolute cell concentration. B) cellular components of small microbes because of the limits of magnification. C) genetic and functional diversity of microorganisms in the habitat under study. D) physical microbial interactions as found in nature.
In birds, sex is determined by a ZW chromosome scheme that is much like the typical XY scheme seen in humans and many other organisms, except that the system is reversed:
Males are ZZ (similar to XX in humans) and females are ZW (similar to XY in humans). A lethal recessive allele that causes death of the embryo occurs on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male heterozygous for the lethal allele and a normal female? A) 1:1 male to female B) 3:1 male to female C) 1:2 male to female D) 2:1 male to female
Today nearly every nation in the world belongs to the United Nations
a. true b. false
The eukaryotic cell organelle that most resembles a bacterial cell is the
A) Ribosome B) Golgi apparatus C) Lysosome D) Mitochondria E) Nucleus