The digestive system of most animals is lined with cells through which nutrients are absorbed. What is the embryonic origin of these cells?
A) endoderm
B) ectoderm
C) mesoderm
Answer: A
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An autosome is a ____
a. chromosome other than a sex chromosome b. structure used to transport genetic material to the cytoplasm c. chromosome containing a group of genes involved in autoimmune disorders d. region of the DNA that is self-replicating e. cellular body involved in autoimmune disorders
Which of the following is involved in the prevention of polyspermy?
A. acrosome of the sperm B. fusion of the sperm and egg nucleus C. depolarization of the egg's plasma membrane D. changes within the corona radiata E. the number of chromosomes contained within the sperm
The region of the small intestine with the lowest pH is the ________
Fill in the blank(s) with correct word
In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with white flowers crossed with a dwarf plant with purple flowers produces 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white. What is the genotype of the parents?
A. Dd Pp x Dd pp B. Dd Pp x Dd Pp C. DD Pp x dd Pp D. Dd pp x dd Pp E. DD Pp x dd pp