A blood vessel is indicated by the letter ____
a. A
b. B
c. C
d. D
e. E
ANSWER: b
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Mendel chose the garden pea for his work on inheritance for which of the following reasons? Check all that apply.
_____ Some traits in pea plants are controlled by one dominant allele and one recessive allele. _____ Earlier investigators had shown segregation among the offspring. _____ A large number of true breeding varieties were available. _____ The generation time was short; many offspring can be grown easily. _____ He could choose to self- or cross-pollinate.
In the past, species of sponges, cnidarians, and ctenophores were referred to as "lower" or "primitive" animals because of their relatively simple body plans and lack of any sophisticated organ differentiation
Which of the following suggest that the terms "lower" or "primitive" are not useful as descriptors for these organisms? A. Many members of these groups are active predators and feed on other organisms. B. These groups have been around for millions of years, so their evolutionary path has been successful in spite of limited complexity. C. These groups are not primary producers, so should not be classified as "lower" because they occur higher on the trophic pyramid. D. These groups harbor a lot of genetic variation; "lower" groups would have less evolved genomes.
In your biology lab, you use a stereoscopic microscope to observe a living animal that uses only one opening to both take in its food and eject its waste products. What is the body arrangement of this animal?
A. gastrovascular cavity B. incomplete digestive tract C. complete digestive tract D. complete digestive tract and a gastrovascular cavity E. incomplete digestive tract and a gastrovascular cavity
Paired homologous chromosomes are found at the spindle equator during
A) telophase I. B) metaphase II. C) prophase II. D) metaphase I. E) anaphase II.