Which of the following is NOT TRUE about meiosis?
a. Homologous chromosomes pair up in Prophase I.
b. Each chromosome has two sister chromatids during Prophase I.
c. Each chromosome is attached by one spindle during Prophase I.
d. After the first division, the two resulting cells are still diploid.
e. Meiosis only occurs in germ cells and not in somatic cells.
D
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Gene methylation can be detected through the use of restriction endonucleases. Usually these are used in pairs where one enzyme will digest only unmethylated DNA in its recognition sequence while the other is insensitive to methylation
Which of the following statements is correct? A. The enzyme that is insensitive to methylation serves as a control to make sure the inability of the other enzyme to digest DNA is not due to a mutation B. These are used in pairs since experiments have to be replicated and this one way of performing a replication of the experiment C. The experimental design is flawed since there should be a third enzyme that would serve as a positive cocntrol D. This experimental design is able to detect most of the methylated C residues in a particular region of DNA.
Polar bodies are unique products of ________
A) cytokinesis B) oogenesis C) mitosis D) spermatogenesis
If two parents have blood genotypes IAi and IBi, which of the following blood genotypes are possible in their children?
A. IAi and IBi only B. IAi, IBi, and ii only C. IAi, IBi, IAIB and ii D. IAi, IBi, and IAIB only E. IAIA, IBIB, and IAIB only
Which one of the following best explains how water moves freely across a plasma membrane?
A) Water moves directly through the phospholipid bilayer because of the charges on phospholipids. B) Water is brought into the cell by facilitated diffusion but released by exocytosis. C) It is actively transported across the membrane. D) Water moves through protein-lined channels in the plasma membrane. E) The passage of water across a plasma membrane requires facilitated transport.