STAAR Review Day 4 Post Quiz

A student groups different types of cells as shown. Which table headings should the student use for the two groups?

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A singe-celled organism can be classified as a prokaryote based on the absence of -

• a cell membrane

• ribosomes

• chromosomes

• a nucleus

Taq polymerase is an enzyme used in the polymerase chain reaction (PCR) to replicate fragments of DNA. A study published in 1976 examined the properties of Taq polymerase after the enzyme was isolated from Thermus aquaticus, a thermophilic bacterium that lives in the hot springs of Yellowstone National Park. The graph shows one of the results of the study.

Which statement about enzyme activity is best supported by this graph?

• An enzyme must be composed of multiple polypeptides, or subunits, to be active

• An enzyme’s rate of activity increases with time until it becomes inactive

• An enzyme functions best under specific temperature conditions

• An enzyme works equally well in bacteria that are adapted to high temperatures and in eukaryotic cells such as human cells

The diagram represents one way an enzyme can be inhibited.

Which statement explains the effect of an inhibitor on an enzyme?

• A substrate will be able to bond with the enzyme

• The enzyme will likely be attacked by immune cells

• The enzyme will be unable to produce more enzymes

• A substrate will be unable to attach to the enzyme

The human body is composed of organ systems. Which list represents a system organized from least to most complex?

• Heart --> cardiac muscle --> muscle tissue --> muscle cell

• Lung tissue --> trachea --> nostrils --> circulatory system

• muscle cell --> muscle tissue --> biceps muscle --> muscular system

• Integumentary system --> skin cell --> hair --> sweat glands

Some students used information they gathered from lab investigations to prepare a table. They entered the table in their lab notebooks.

Which of these correctly identifies the two cells described in the table?

• Cell 1 is eukaryotic, and Cell 2 is prokaryotic.

• Cell 1 is prokaryotic, and Cell 2 is eukaryotic.

• Both Cell 1 and Cell 2 are eukaryotic.

• Both Cell 1 and Cell 2 are prokaryotic.

A student reads this advertisement for a product containing a plant micronutrient that can be added to soil.

Based on this information, the student can conclude that boron is absorbed by plant roots from soil and then —

• transported to reproductive tissues by the plant’s shoot system

• stored in plant stems until the flowers are pollinated

• concentrated in the roots until the plant’s reproductive tissues mature

• transported by the phloem to the stomata in leaves, where it attracts pollinators

Several structures work together to allow flowering plants to reproduce. The diagram shows a typical flower.

Which table correctly identifies the function of each structure or group of structures in the reproduction of the plant?

• X Pollen production

  Y Pollen transfer

  Z Production of eggs

• X Attraction of pollinators

  Y Production of male sex cells

  Z Egg production and embryo development

• X Protection for embryo

  Y Supply nourishment to embryo

  Z Place of embryonic development

• X Photosynthesis

  Y Production of cells that protect internal organs

  Z Production of egg and sperm

The internal transport of water and minerals in plants requires that two systems work together. Which diagram correctly describes how the two systems accomplish this?

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A corn plant produces both male and female flowers. The male flower forms the tassel and the female flower forms the ear of corn. The silks that emerge from the ear are the stigma of the female flower. Each silk leads to an ovule that can become a corn seed.

Which of these must happen for corn seeds to develop on the ear?

• More tassels than silks need to be present on the same plant

• Pollen grains must fall from tassels and land on the silks of the ear

• Pollen must be transported from the tassel to the silk through the phloem

• The tassels must come into direct contact with the silks of the ear