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3 years ago

An event lasts 4 hours and 20 minutes. How long did the event last in seconds?

Biology

1 answer:

daser333 [38]3 years ago

7 0

The event last in 15,600 seconds.

Answer: Option B

Explanation:

We know that there is 60 seconds in one minute i.e., 1 minute = 60 seconds

There is 60 minutes in one hour. i.e., 60 minutes = 1 hour.

Given : An event lasts 4 hours and 20 minutes

4 hours contains 240 minutes,

$4 \times 60=240 \text { minutes }$

When the above expressed in seconds,

$240 \times 60=14400 \text { seconds }$ ------>eq. 1

When 20 minutes expressed in seconds,

$20 \times 60=1200 \text { seconds }$ ------->eq. 2

Adding both eq. 1 and 2, we get

4 hours and 20 minutes = 14400 + 1200 = 15600 seconds

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For the following three cultures, using any resource find out if they are obligate aerobes, facultative anaerobe, or obligate an

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Answer:

Escherichia coli - Facultative anaerobe

Micrococcus luteus - Obligate aerobe

Clostridium sporogenes - Obligate anaerobe

Explanation:

In simple terms, obligate aerobes are organisms that require oxygen to grow and metabolize molecules such as fats and sugars to produce energy. Many animals fall under this category. Other examples are Mycobacterium tuberculosis and Micrococcus luteus.

Facultative anaerobes are organisms (usually bacteria) that can grow both in the presence and absence of oxygen. The most example of this are the Escherichia coli.

Obligate anaerobes are organisms (usually microorganisms) that cannot survive when exposed to normal atmospheric concentration of oxygen. Examples are Clostridium sporogenes and Clostridium botulinum.

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3 years ago

Which of the following is a biotic component that would help determine the health of an ecosystem

Elden [556K]

Answer:plants

Explanation:the greener and more vegetated ecosystem is more healthier with plenty of habitat,food and moisture provided for other living organisms and also attracting agents like pollinators .

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3 years ago

1. in an ecosystem with four levels—producers, primary consumers, and two higher-level consumers—describe where the decomposers

attashe74 [19]

Decomposers, as the name suggests, decompose dead plants or animals into simple compounds. They feed on dead producers from the first levels or consumers from other three levels. Breaking them down, decomposers release nutrients that producers can use.
In an ecosystem with four levels, the first level are producers, such as plants and algae. On the second trophic level, there are primary consumers, herbivores that eat plants, for example, a deer, a rabbit, a grasshopper. The next trophic level belongs to secondary consumers that eat herbivores, for example, a wolf, a fox. The highest level is tertiary consumers that eat carnivores, for example, a bear, an eagle.

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3 years ago

Read each of the sentences that describe a phase of meiosis. Place each sentence into the correct box.

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Answer:

prophase 1(Homologous chromosomes pair to form a tetrad.

prophase 1(Crossing-over may occur between the non-sister chromatids).

Metaphase 1 (Homologous chromosomes line up at the center of the cell.)

Anaphase 1 (Homologous pairs separate and move towards opposite ends of the cell)

Telophase 1 (A nuclear membrane forms and cytokinesis follows).

Metaphase 2 ( The haploid number of duplicated chromosomes line up at the metaphase plate.

Anaphase 2 (Sister chromatids separate and become daughter chromosomes that move to the poles)

Meiosis 2: Four haploid daughter cells are formed that are not genetically identical.

Explanation:

Meiosis is a type of cell division that gives rise to gametes ( offsprings). This type of cell division occurs only in the reproductive organs. A diploid cell has two sets of chromosomes: one from the female parent and the other one from the male parent. When the diploid cell undergoes meiosis, the chromosome replicate once and the nucleus and cell duplicate twice giving rise to four haploid gamete cells.

The phases of meiosis occurs in two step divisions. Homologous pairs separate during the first round cell division which occurs in MEIOSIS 1 while the sister chromatids separate in the second nuclear division called MEIOSIS 2.

In each round of division, cells go through four stages: PROPHASE, METAPHASE, ANAPHASE, and TELOPHASE. The specific events that occur in these stages are already listed in the above answer.

Generally, at the start of meiosis, each member of a homologous pair of chromosomes, which are made up of two chromatids, moves to lie side by side. While they are thus paired, genetic material is exchanged between the chromatids. This is known as CROSSING OVER.

When the nucleus divides for the first time, the chromosomes in a given pair( not the chromatids) separate and move to opposite ends of the cell. This results in only half the number of chromosomes going to each daughter cell.

During the second nuclear division, the chromatids separate and move to opposite ends of each daughter cell giving rise to four gamete cells, each with a haploid number of chromosomes.

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3 years ago

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the graph shows how the rate of photosynthesis of a plant varies with light intensity. interpret the graph and justify statement

dezoksy [38]

The graph shows that the rate of photosynthesis increases with increased light intensity, other conditions being constant.

<h3>Photosynthesis and light intensity</h3>

From the graph, the rate of photosynthesis increases with an increase in light intensity.

At low light intensity, the photosynthesis rate increases with an increase in the concentration of carbon dioxide and level off at some point.

With medium light intensity, the rate of photosynthesis is about twice that of low light intensity under the same concentration of carbon dioxide. It also gradually levels off when the concentration of carbon dioxide reached a particular point.

The same trend applies to high light intensity. The rate of photosynthesis increased accordingly, much more than low and medium-intensity light.

Both light and carbon dioxide concentration can limit the rate of photosynthesis. When both factors are abundant, photosynthesis can be limited by other factors such as water, nutrient, etc.

More on light and photosynthesis can be found here: brainly.com/question/13201447

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