BIOLOGY HIGH SCHOOL

Which one of the following steps would be included in the primary response in humoral immunity?A. Antigen binds to antibodies
B. Cytotoxic T cells bind to infected body cells and destroy them
C. Helper T cells activate cytotoxic T cells
D. A macrophage consumes a virus and displays antigens on its surface and signals helper T cells to divide.

Answers

Answer 1
Answer: The primary immune response in humoral immunity, when we're talking about our body's natural defence capabilities against harmful foreign or domestic invaders would be when a macrophage consumes a virus and displays antigens on its surface and signals helper T cells to divide - D. This is usually our first line of defence found on the spot.

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Which of the following occurs in meiosis but not in mitosis? A) chromosome replication
B) synapsis of chromosomes
C) production of daughter cells
D) alignment of chromosomes at the equator
E) condensation of chromatin

Answers

The process that occurs in meiosis but not in mitosis is: synapsis of chromosomes

MEIOSIS AND MITOSIS:

  • Meiosis is a kind of cell division that results in the production of four daughter cells (haploid) that are genetically different from one another.

  • Meiosis occurs in different stages namely: prophase, metaphase, anaphase and telophase.

  • In the prophase stage, homologous chromosomes lie side by side to form a structure called tetrad. This process is called synapsis.

  • Synapsis of chromosomes is unique to only meiotic division and hence, does not occur in mitotic division.

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Final answer:

The process that is unique to meiosis and not found in mitosis is synapsis of chromosomes, which happens during prophase I of meiosis. This involves the pairing of homologous chromosomes and the formation of tetrads leading to genetic variation.

Explanation:

Among the options provided, the process that occurs in meiosis but not in mitosis is the synapsis of chromosomes (option B). Synapsis happens during the prophase I of meiosis, where homologous chromosomes pair up aligning their genes in a process known as synapsis. This is unique to meiosis and results in the formation of tetrads which eventually leads to genetic variation due to crossing over. In contrast in mitosis which is involved in somatic cell division, homologous chromosomes do not pair up or form tetrads.

Learn more about Synapsis of Chromosomes here:

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A calorie is a unit of

Answers

a calorie is a unit of energy
Calories are units of energy.

Why are catfish and carp found at the mouth of a river, while trout are found nearer the source?

Answers

Answer:

The correct reason would be "the levels of dissolved oxygen at the mouth of the river and at the source of the river".

The mouth of the river is the region where it flows into the ocean, lake, another river, reservoir, sea et cetera. The level of dissolved oxygen in this region is too low to support great biodiversity.

Organisms like catfish and carp can survive here due to their low oxygen demand. For example, catfish can survive in water with an oxygen content of 2.5 parts per million.

In contrast, the level of dissolved oxygen is higher at the source of the river. Organisms like trout are found here due to their high oxygen need. For example, rainbow trout require minimum 5-6 parts per million dissolved oxygen for its survival.
Catfish and carp require less oxygen than trout. The mouth of a river usually has less oxygen and the area closer to the source has more oxygen, so since catfish and trout require more oxygen they typically are found at the source.

What are the three main components of a DNA molecule?A. a sugar, a nucleotide, and an amino acid
B. a sugar, a water molecule, and a nitrogenous base
C. a sugar, a phosphate group, and a nitrogenous base D.
a sugar, a phosphate group, and an amino acid

Answers

Answer:

a sugar, a phosphate group, and a nitrogenous base

Explanation:

i had it for study island that was the correct answer

Answer:

a sugar, a water molecule, and a nitrogenous base

Explanation:

What is the definition of taxonomy?

Answers

Taxonomy is the classification or grouping of organisms into groups, based on shared or similar characteristics. The criteria used for including an organism in a group can be controversial. An example of a taxon is the class Reptilia.

What characteristic do all algae share?

Answers

They are autotrophs.
they are autotrophs because they make their own food like protists do via photosynthesis.(Was this helpful?)
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