Leeches belong to the phylum
(a) Arthropoda.
(b) Mollusca.
(c) Annelida.
(d) Cnidaria
(d) Cnidaria
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Which of the following statements is false?
A. After entering the uterus, sperm must pass through the cervix in order to enter the fallopian tubes. B. During ovulation the oocyte is expelled from the ovary and enters the fallopian tubes. C. The oocyte is the largest cell by volume in the human body. D. Some types of cervical mucus block the passage of sperm, whereas other types guide sperm. E. If an oocyte is not fertilized then it is removed from the body through menstruation.
Place the following events of mitosis in the correct order.
I. Sister chromatids align on the metaphase plate. II. The cleavage furrow forms. III. The nuclear membrane breaks up. IV. Sister chromatids condense. V. Sister chromatids separate. A. I, II, III, IV, V B. III, IV, I, V, II C. IV, III, I, V, II D. III, II, I, IV, V E. IV, I, III, V, II
Where is the palisade mesophyll positioned within the leaf?
a. One layer above the lower epidermal surface b. Within the vascular layer c. On the lower epidermal layer d. One layer below the upper epidermal surface e. On the upper epidermal surface
Karyotype analysis ____
a. is a means of detecting and reducing mutagenic agents b. is a surgical technique that separates chromosomes that have failed to segregate properly during meiosis II c. can be used in prenatal diagnosis to detect chromosomal mutations and genetic disorders in embryos d. replaces defective alleles with normal ones e. is used in DNA analysis for paternity