The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
A. the cell membrane was composed of lipids and proteins.
B. the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins.
C. the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer.
D. the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed.
C
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Small animals such as insects and some lizards are able to “walk on water.” This ability is due
to the
a. strong bonds between oxygen and hydrogen atoms forming the water molecule. b. attraction among different water molecules due to the unequal attraction of electrons of hydrogen and oxygen in individual water molecules. c. bonds that form between two atoms that are oppositely charged. d. strong bonds that form between water molecules due to sharing of electrons in the same orbit.
Orchitis and epididymitis are seen in young, adult males as a complication of ________.
A. gingivitis B. mumps C. hepatitis D. tapeworm infestation
An autosomal recessive disorder:
A) will appear only in children of parents who both carry the gene. B) is more frequent in males than females. C) is dominant in females. D) displays its symptoms only in heterozygotes. E) requires that only one parent be a carrier.
Which of the following statements about pre-transcriptional regulation is false?
A) It allows organisms to rapidly respond to frequent and dramatic changes in the environment. B) It is the one way cells can manage to control protein synthesis. C) It helps cells control when transcription occurs. D) It is managed by transcription factors. E) It helps cells control how often transcription occurs.