Other Biology Answers

what is a protist

what is chromatic aberration

Why are the following practices considered “Good Laboratory Practices”? Justify your answer. -Study experiences before attending the laboratory -Do not use the cell phone, drink, eat and smoke in the laboratory -Don't smell and taste the working chemicals.

Non-segmentation allows for evolutionary innovation in body form. True or False

1. define in your own words what the scientific method is
2. what is the difference between a fact and a hypothesis

Explain what is the problems or challenges of habitat fragmentation?

1.     After a severe ecological disturbance, explain the importance and role of pioneer plants. (2 marks)

Pioneer plants are important because they replace the species that were lost during a forest fire. Its also the first stage of succession. 

is this right? let me know thanks

1.     Explain the important of a keystone species in a community. (2 marks)

 keystone species are important in a community because keystones determine the communities structure. If it is removed, community interactions are significantly altered, and the other species change dramatically.

this too

a)     Assume the population of Bacteria B completely dies off. Bacteria A are now transferred to an open environment where they have lots of room for growth and a continual supply of food. Over the course of three days, the population of bacteria steadily increases as follows:

Day 1: 1500 bacteria

Day 2: 3000 bacteria

Day 3: 7000 bacteria

Day 4: 13,000 bacteria

Is this population of bacteria r-selected or k-selected? Explain how you arrived at your answer. Hint: Review your definitions of “r” and “k.” (2 marks)

This bacteria is k selected, because k-selected species mature slowly, they have a longer life span and they provide more parental care so that when their offspring matures it can survive in any environment.  Correct?

1.     Bacteria A and Bacteria B are considered hardy bacteria and can survive in extreme environments when grown individually. However, when they are grown together in a closed environment (on an agar plate), Bacteria A thrives, while Bacteria B eventually dies off. 

a)     Calculate the density per cubic centimetre of Bacteria A on the agar plate if there are 1500 bacteria on a 100cm³ plate. (1 mark)

Dp=N/A

1500/100^3

= 15?

is this right??????

a.     You are having a conversation with Cindy, the magic turtle. Cindy is very curious about the formation of species. She tells you excitedly how one species of turtle inhabited the same geographical area, but ended up forming two different species over time. She admits she is a bit surprised by this; she thought that populations needed to be geographically separated from each other in order to form two different species. Explain to Cindy how speciation can occur without geographical separation. Name the type of pathway to speciation that occurred in this case. (3 marks)

Speciation can occur without geographical separation through sympatric speciation. Sympatric speciation is best defined as, when two populations share the same geographic area. Ecological isolation can reduce gene flow, and mutations can lead to genetic isolation. 

*** I need to know if my answer is correct. As i have an assignment that is due tomorrow.