Answer the following questions true (T) or false (F)
1. When a virus takes over the machinery of a cell, it forces the cell to manufacture more viral particles.
2. Bacteria are considered to be a type of protist.
3. The simplest eukaryotes are the bacteria.
1. TRUE
2. FALSE
3. FALSE
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DNA replication is said to be semiconservative because
a. the number of nucleotides within genes remains constant. b. half of the DNA in a cell comes from one parent and the other half from the other parent. c. the same process of DNA replication is used by all organisms. d. the total amount of DNA within an individual remains the same. e. each new DNA molecule is composed of one old strand and one new strand.
Double fertilization in flowering plants refers to ________
a. two sperm fertilizing a single egg b. two sperm fertilizing two eggs c. a single sperm fertilizing two eggs d. a sperm fertilizing an egg and another sperm fertilizing the endosperm mother cell
The least oxygenated water is indicated by
a. A. b. B. c. C. d. D. e. E.
Some amphibians:a
may exchange gases across their body surfaces. b. all have fairly simple, book lungs. c. all have gills and swim bladders, homologous to those found in fishes. d. are characterized by having parabronchi across which most of the gas exchange occurs. e. have a large oxygen demand that is met by using a countercurrent gas exchange mechanism