During receptor-mediated endocytosis, ____.

A. plasma membrane receptors bind molecules to be expelled
B. a small channel forms beneath the receptors
C. a pit opens inside a cell
D. a vesicle forms
E. a vesicle is destroyed


Answer: D

Biology & Microbiology

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At the summit of a high mountain, the atmospheric pressure is 380 mm Hg. If the atmosphere is still composed of 21percent oxygen, then the partial pressure of oxygen at this altitude is about _____

A) 0 mm Hg B) 80 mm Hg C) 160 mm Hg D) 380 mm Hg E) 760 mm Hg

Biology & Microbiology

In cancer cells one allele of the tumor suppressor gene p53 is frequently mutated so that the protein is inactive, not produced, or deleted

The other allele will usually have a normal sequence and the promoter remains intact but the gene is not expressed. Sequencing with sodium bisulfite modification of DNA can be used to detect which cytosines are methylated. If the cancer cell DNA is sequenced what would be the anticipated results? A. Cytosines in or near the promoter region will be methylated B. Cytosines in or near the promoter will not be methylated C. Cytosines in the coding region will have an increased mehtylation D. There will be no differences in the methylation pattern of the promoter of p53 from a cancer cell and a normal cell

Biology & Microbiology

Organisms that demonstrate type I

survivorship are characterized by a. high r, small offspring. b. low r, small offspring. c. low r, large offspring. d. high r, large offspring. e. low r, large population size

Biology & Microbiology

Bacterial cells that are variable in shape are called ________.

A. hyphal B. coccobacilli C. pleomorphic D. vibrio

Biology & Microbiology