Which of the following is not a characteristic of nematodes?
A. They have bilateral symmetry.
B. They exhibit cephalization.
C. They are unsegmented.
D. They have a coelom.
E. They have a complete digestive tract.
D. They have a coelom.
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Metal ions are a common type of ____ for enzymes
Fill in the blank with the appropriate word.
Which structure holds homologous chromosomes tightly together and supports them as they undergo recombination?
a. kinetochore b. centromere
c. microtubules d. spermatozoa e. synaptonemal complex
Identify the correct comparison between the human X and Y chromosomes.
A. Only the X chromosome is paired with a homologous match in human females. B. The X chromosome is larger than the Y chromosome. C. Only the Y chromosome is always found without a homologous match. D. Although both are sex chromosomes, they do not share the same genes. E. All of the answer choices are correct.
Cells becoming progressively more specialized in their structure and gene activity is known as:
a. morphogenesis. b. determination. c. differentiation. d. maturation. e. growth.