Which of the following occurs during mitosis but not during meiosis 1?
A. The chromosomes are pulled to opposite poles of the spindle apparatus
B. The chromatids of each chromosome are separated
C. The nuclear envelope breaks down
D. Both synapsis and crossing over take place
E. The diploid number of chromosomes is reduced to the haploid number
Answer: B. The chromatids of each chromosome are separated
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According to the cohesion-tension mechanism of water transport, cohesion occurs because ____
a. waxy coatings on insides of xylem keep water molecules together in the xylem b. evaporation removes water from the leaves c. water molecules tend to form hydrogen bonds with each other d. water is pushed into the xylem by bulk flow e. water is pushed into the xylem by phloem pressure
Amniocentesis is
a. a surgical means of repairing deformities. b. a form of chemotherapy that modifies or inhibits gene expression or the function of gene product. c. used in prenatal diagnosis to detect chromosomal mutations and genetic disorders in embryos. d. a form of gene replacement therapy. e. all of these.
A(n) ____ is an offspring of a cross between two individuals that breed true for different forms of a given trait
a. homozygote b. recessive c. hybrid d. phenotype e. genotype
A disaccharide, such as maltose, consists of two molecules of glucose linked by what type of bond?
A. glycosidic B. hydrogen C. peptide D. phosphodiester E. steroid