________ is the total of all chemical reactions occurring in the cell.
Fill in the blank(s) with the appropriate word(s).
Metabolism
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The nuclear membrane functions as a
A) means of separating nuclear and cytoplasmic constituents. B) means of localization of the chromosomes within the cell. C) selective barrier, allowing certain substances in or out. D) means of sequestering many of the mRNA processing activities from the cytosol. E) all of the above
Baby frog #1 is homozygous for a mutant allele of gene B (allele b1). Compare the DNA sequence from baby frog #1 with the wild-type sequence to determine how allele b1 is different from the wild-type. What effect does the mutation in allele b1 have on the protein?
A) Allele b1 has a frameshift mutation—a deletion of one nucleotide resulting in a frameshift that changes all amino acids from that point on.
B) Allele b1 has a deletion of one nucleotide outside of the coding region and there is not effect on the protein.
C) Allele b1 has a missense mutation—a nucleotide substitution that changes one amino acid to another.
D) Allele b1 has a nonsense mutation—a nucleotide substitution that forms a stop codon.
E) Allele b1 has a nucleotide substitution that does not change the protein.
A chicken has 78 chromosomes. A chicken cell will contain _____ chromosomes at the beginning of prophase and
_____ chromosomes after mitotic division is complete.
a. 78; 39 b. 78; 78 c. 39; 78 d. 156; 78 e. 78; 156
Which action is an example of voluntary muscle contraction?
A) a push-up B) peristalsis C) a heartbeat D) stomach churning