Steele HS Biology Blitz Category 1 2019

The picture shows a student using a microscope to study a prepared slide of a single-celled organism.

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

• a cell membrane

• ribosomes

• chromosomes

• a nucleus

A remora is a fish that has an adhesive disk on the back of its head that it uses to attach itself to a large shark. When food floats away from the shark’s mouth as it feeds, the remora collects the scraps. Drawings of a shark with a remora attached and a remora’s adhesive disk are shown below.

• predation

• parasitism

• commensalism

• competition

Part of the cell cycle is shown in this simplified model.

This part of the cell cycle is best described as the process that —

• duplicates the DNA

• completes cell division

• maintains genetic homeostasis

• synthesizes new molecules

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The human immunodeficiency virus (HIV) often infects and destroys CD4 T cells. These CD4 T cells are one of many kinds of white blood cells that are an important part of the immune system.

The most common danger related to the destruction of CD4 T cells is —

• an increase in the risk of high blood pressure

• an increase in the threat of diseases caused by microorganisms and viruses

• a decrease in the flow of blood to vital organs

• a decrease in the amount of oxygen being transported to tissues

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Students were given a list of seven elements and asked to identify the four elements that are most abundant in biomolecules. Which table correctly identifies the four most-abundant elements in biomolecules?

• 
• 
• 
• 

Which molecule synthesized by plants is a major source of energy for cellular processes in both plants and animals?

• Wax

• Nucleic acid

• Glucose

• Chlorophyll

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From a single fertilized ovum undergoing a series of rapid cell divisions, a human infant develops. The embryonic cells become specialized for a variety of functions. Which of these statements best describes how different cell types develop?

• Each cell type contains only the active parts of the DNA needed for that cell type.

• Each cell type has only one chromosome containing the DNA needed for that cell type.

• Each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells.

• Each cell has multiple copies of DNA that are affected in different ways by the

  environment to change the function of the cell at regular intervals.

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The energy pyramid below shows the energy made available by producers.

Based on the energy flow between trophic levels in an energy pyramid, how much energy would be expected to be found at the secondary consumer level in this pyramid?

• 100 joules

• 500 joules

• 1,000 joules

• 50 joules

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NGSS.MS-LS2-3

The surface of the stomach is lined with epithelial cells called surface mucous cells. These cells produce a thick mucus that coats the epithelium on the inside surface of the stomach. What is the purpose of the mucous coating?

• It allows the epithelium to aid in the process of digestion.

• It causes the epithelium to expand as food enters the stomach.

• It protects the epithelium from the acid content of the stomach.

• It traps nutrients inside the epithelium as food passes through the stomach.

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NGSS.MS-LS1-3

People who have leukemia, a cancer that affects white blood cells, are often given Cytarabine. This drug inhibits the synthesis of DNA. Which phase of the cell cycle is most affected by Cytarabine?

• G1 phase

• S phase

• G2 phase

• M phase