Q: In single-celled organisms, what does the plasma membrane extensions help the organisms to do? Read this paragraph and choose the correct option from the provided answers: The plasma membrane may have extensions, such as whip-like flagella or brush-like cilia . In single-celled organisms, like those shown in Figure below , the membrane extensions may help the organisms move. In multicellular organisms, the extensions have other functions. For example, the cilia on human lung cells sweep foreign particles and mucus toward the mouth and nose. Choices: - increase - inspect - prevent - move A:
move

(Question)
Q: What is defined as the velocity of the object at a given moment? Read this paragraph and choose the correct option from the provided answers: The instantaneous velocity of an object is the velocity of the object at a given moment. If the object is moving with constant velocity, then the instantaneous velocity at every moment, the average velocity, and the constant velocity are all the same. Choices: - specific gravity - relativistic velocity - inertia - instantaneous velocity A:
(Answer)
instantaneous velocity

Ques: Q: The single circular dna chromosome of bacteria is not enclosed in what, but instead occupies a specific location called the nucleoid within the cell? Read this paragraph and choose the correct option from the provided answers: Binary Fission Due to the relative simplicity of the prokaryotes, the cell division process, called binary fission, is a less complicated and much more rapid process than cell division in eukaryotes. The single, circular DNA chromosome of bacteria is not enclosed in a nucleus, but instead occupies a specific location, the nucleoid, within the cell (Figure 10.2). Although the DNA of the nucleoid is associated with proteins that aid in packaging the molecule into a compact size, there are no histone proteins and thus no nucleosomes in prokaryotes. The packing proteins of bacteria are, however, related to the cohesin and condensin proteins involved in the chromosome compaction of eukaryotes. The bacterial chromosome is attached to the plasma membrane at about the midpoint of the cell. The starting point of replication, the origin, is close to the binding site of the chromosome to the plasma membrane (Figure 10.15). Replication of the DNA is bidirectional, moving away from the origin on both strands of the loop simultaneously. As the new double strands are formed, each origin point moves away from the cell wall attachment toward the opposite ends of the cell. As the cell elongates, the growing membrane aids in the transport of the chromosomes. After the chromosomes have cleared the midpoint of the elongated cell, cytoplasmic separation begins. The formation of a ring composed of repeating units of a protein called FtsZ directs the partition between the nucleoids. Formation of the FtsZ ring triggers the accumulation of other proteins that work together to recruit new membrane and cell wall materials to the site. A septum is formed between the nucleoids, extending gradually from the periphery toward the center of the cell. When the new cell walls are in place, the daughter cells separate. Choices: - atom - molecules - protons - nucleus A:
Ans: nucleus

(Q).
Q: What structure is made from dna and protein molecules coiled together? Read this paragraph and choose the correct option from the provided answers: As a cell prepares to divide, its DNA first forms one or more structures called chromosomes. A chromosome consists of DNA and protein molecules coiled into a definite shape. Chromosomes are circular in prokaryotes and rodlike in eukaryotes. You can see an example of a human chromosome in Figure below . The rest of the time, DNA looks like a tangled mass of strings. In this form, it would be very difficult to copy and divide. Choices: - bacterium - enzymes - atoms - chromosome A:
(A).
chromosome

Ques:Q: What evolutionary strategy enables substantial activity during sleep for some animals? Read this paragraph and choose the correct option from the provided answers: Choices: - hibernation - reproduction - mutation - adaptation A:

Ans:adaptation

Question: Q: What term is used to describe large numbers of species that go extinct in a short amount of time? Read this paragraph and choose the correct option from the provided answers: Sometimes large numbers of species go extinct in a short amount of time. This is a mass extinction . The causes of different mass extinctions are different: collisions with comets or asteroids, massive volcanic eruptions, or rapidly changing climate are all possible causes of some of these disasters ( Figure below ). Choices: - formation extinction - organic extinction - species extinction - mass extinction A:
Answer:
mass extinction