Answer the following question given this paragraph: The first organisms were made of only one cell ( Figure below ). The earliest cells were prokaryotes . Prokaryotic cells are surrounded by a cell membrane. They do not have a nucleus. Their organelles are free in the cell. The cells get their nutrients directly from the water they live in. The cells need to use these nutrients to live and grow. Q: The earliest cells were prokaryotes, surrounded by a cell membrane but lacking which key structure? Choices: - mitochondria - ribosomes - lysosomes - nucleus A:
nucleus
(Question)
Answer the following question given this paragraph: Point source pollution results from the contaminants that enter a waterway or water body through a single site. Examples of this include untreated sewage, wastewater from a sewage treatment plant, and leaking underground tanks. Q: What type of pollution results from the contaminants that enter a waterway or water body through a single site? Choices: - liquid source pollution - simple source pollution - targeted source pollution - point source pollution A:
(Answer)
point source pollution
Ques: Answer the following question given this paragraph: A Punnett square is a chart that allows you to easily determine the expected percentage of different genotypes in the offspring of two parents. An example of a Punnett square for pea plants is shown in Figure below . In this example, both parents are heterozygous for flower color ( Bb ). The gametes produced by the male parent are at the top of the chart, and the gametes produced by the female parent are along the side. The different possible combinations of alleles in their offspring are determined by filling in the cells of the Punnett square with the correct letters (alleles). At the link below, you can watch an animation in which Reginald Punnett, inventor of the Punnett square, explains the purpose of his invention and how to use it. http://www. dnalc. org/view/16192-Animation-5-Genetic-inheritance-follows-rules-. html. Q: What is the name of the chart that allows you to easily determine the expected percentage of different genotypes in the offspring of two parents? Choices: - periodic square - DNA helix - Trafalgar Square - punnett square A:
Ans: punnett square
(Q).
Answer the following question given this paragraph: Q: What part of the brain regulates certain hormones associated with reproduction during breeding seasons? Choices: - thalamus - frontal lobe - hippocampus - hypothalamus A:
(A).
hypothalamus
Ques:Answer the following question given this paragraph: Q: What globular protein is used in the construction of the hollow tube? Choices: - actin - cyclin - keratin - tubulin A:

Ans:tubulin
Question: Answer the following question given this paragraph: Fossils are a window into the past. They provide clear evidence that evolution has occurred. Scientists who find and study fossils are called paleontologists . How do they use fossils to understand the past? Consider the example of the horse, shown in Figure below . The fossil record shows how the horse evolved. Q: Scientists who find and study fossils are called what? Choices: - biologists - geologists - anthropologist - paleontologists A:
Answer:
paleontologists