Bacteroids are ____
a. specialized nitrifying bacteria
b. small buds from ammonifying bacteria
c. specialized bacteria that help some plant roots absorb phosphorus
d. enlarged and immobilized nitrogen-fixing bacteria
e. interactions between plant root hairs and bacteria
ANSWER: d
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The organism shown above is using which of the
following types of reproduction? a. asexual budding b. sexual production of eggs c. hermaphroditic co-fertilization d. a combination of all three e. none of these
Which time period would hold the record of the oldest fossils of multicellular animals, found in mountainous areas of
South Australia, and parts of Canada and China? a. Edicarian b. Devonian c. Cambrian d. Cretaceous e. Ordovician
Crosses between a yellow rat with a yellow rat always produce yellow offspring. Crosses between a white rat with a white rat always produce white offspring. The alleles affect the same aspect of coat color. The cross of a white rat with a yellow rat produces a cream rat. This type of inheritance pattern is called _______________?
Fill in the blank(s) with the appropriate word(s).
Marbles is a calico cat with a Manx tail. She wants to have kittens with a male calico, but can't find one. Male calicos are rare; the only ones have the sex chromosome constitution XXY. Male calicos are therefore rare because
A) all male cats have a dominant gene on the Y chromosome that masks the calico gene on the X chromosome. B) most male cats only have one Y chromosome, so it cannot be shut off. C) most male cats have only one X chromosome, so it cannot be shut off. D) male calico cats lack sex chromosomes.