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lidiya [134]
3 years ago
7

Many bird species have seasonal behaviors that cause them to _______ or change their location.

Biology
1 answer:
Svet_ta [14]3 years ago
8 0

Answer:

Migrate

Explanation:

Migration is the seasonal behavior of bird species where they relocate to breed, get food, or go to a more suitable climate

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When a specialized function of the cerebral cortex occurs on either the right or the left hemisphere, this is referred to as ___
forsale [732]
The answer is lateralization of brain function. This is the predisposition for some neural functions or cognitive processes to be more prevailing in one hemisphere than the other. The medial longitudinal fissure divides the human brain into two separate cerebral hemispheres, connected by the corpus callosum.
7 0
3 years ago
Biochemical and differential tests can be incorporated into growth media or performed on isolated colonies after they have been
Cloud [144]
<h2>Differential test</h2>

Explanation:

A differential test helps to distinguish that which species lack or have the particular biochemical process,the three differential test media are:

1) Blood agar: Blood Agar is an enriched medium which is used to culture those bacteria or microbes that do not grow easily

  • It is also required to detect and differentiate haemolytic bacteria, especially Streptococcus species
  • It is also a differential media in allowing the detection of hemolysis (destroying the RBC) by cytolytic toxins secreted by some bacteria, such as certain strains of Bacillus, Streptococcus, Enterococcus and Staphylococcus

2) Eosin methylene blue agar (EMB): It is a selective and differential medium used to isolate fecal coliforms

  • Eosin methylene blue are pH indicator dyes which combine to form a dark purple precipitate at low pH; they also serve to inhibit the growth of most Gram positive organisms
  • Sucrose and lactose serve as fermentable carbohydrate sources which encourage the growth of fecal coliforms and provide a means of differentiating them

3) Mannitol Salt Agar (MSA): It is a selective and differential medium

  • The high concentration of salt (7.5%) selects for members of the genus Staphylococcus, since they can tolerate high saline levels
  • Organisms from other genera may grow, but they typically grow very weakly

Three examples of tests which are done on colonies are:

1) Catalase test: Catalase is an enzyme that breaks hydrogen peroxide (H2O2) into H2O and O2

  • Hydrogen  peroxide is often used as a topical disinfectant in wounds, and the bubbling that is seen is due to  the evolution of O2 gas
  • A small amount of growth from the culture is placed onto a clean microscope slide
  • Few drops of H2O2 onto the smear is added
  • A positive result is the rapid evolution of O2 as evidenced by bubbling
  • A negative result is no bubbles or only a few scattered bubbles

2) Indole test: The main requirement for a suitable indole test medium is that it contain

s a sufficient amount of tryptophan

  • Tryptone broth is commonly used
  • The tube of tryptone broth with a small amount of a pure  culture is inoculated
  • Incubation is done at 35°C (+/- 2°C) for 24 to 48 hours
  • To test for indole production, 5 drops of Kovács reagent is directly added to  the tube
  • A positive indole test is indicated by the formation of a pink to red color  in the reagent layer on top of the medium within  seconds of adding the reagent
  • If a culture is indole negative, the reagent layer will remain yellow or be  slightly cloudy

3) Urease test: Urease is a constitutively expressed enzyme that hydrolyzes urea to carbon dioxide and ammonia

  • The urease test identifies those organisms that are capable of hydrolyzing urea to produce ammonia and carbon dioxide
  • Urease test media contain 2% urea and phenol red as a pH indicator
  • An increase in pH due to the production of ammonia results in a color change from yellow (pH 6.8) to bright pink (pH 8.2)
  • Urea broth is a highly buffered medium requiring large quantities of ammonia to raise the pH above 8.0 resulting in a color change
4 0
3 years ago
What is the process of Asexual reproduction? Honey Bees
Vlada [557]

Answer:

ASEXUAL

female worker bees are able to reproduce asexually: they lay eggs that are essentially fertilised by their own DNA, which develop into new worker bees.  The team sequenced the entire genomes of a sample of Cape bees and compared them with other populations of honeybees that reproduce normally.

SEXUAL

The typical story of reproduction is that males and females of an animal species do it sexually. Generally, that's what honeybees do, too. Sperm from a male drone fertilizes a queen's eggs, and she sends out a chemical signal, or pheromone, that renders worker bees, which are all female, sterile when they detect it.

Explanation:

4 0
3 years ago
I need help with this pls ty lol
lakkis [162]
B.

H in HF is slightly positive while O in H2O is slightly negative. So they attract in a polar bond. Btw I thought this is chemistry.
5 0
2 years ago
The____ is critical in the cell cycle because it indicates the cell is ready for division
natulia [17]

Answer:

S phase is the correct answer. Hope this helps...

Explanation:

3 0
3 years ago
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